<!DOCTYPE html>
<html lang="zh-CN">
<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>padding不影响盒子大小</title>
	<style>
		h1 {
			height: 200px;
			background-color: pink;
			padding: 30px;
		}
		div {
			width: 300px;
			height: 100px;
			background-color: purple;
		}
		div p {
			padding: 30px;
			background-color: skyblue;
		}
	</style>
</head>
<body>
	<h1></h1>
	<div>
		<p></p>
	</div>
</body>
</html>